Rotary plate oil burner

ABSTRACT

An oil burner wherein a rotary blower system supplies air to a stationary fuel supply pipe. The pipe has no internal horizontal part except for a short tip of its nozzle. This arrangement counteracts solidification of oil in the supply pipe. Said tip is positioned in such manner that liquid fuel is discharged therefrom centrally of, and in the direction toward, a rotary plate. A blower supplies compressed air to the interstice between housing and plate. From there, a mixture of oil and air then enters a burner ring or the like.

United States Patent Tsuji 14 1 Oct. 10,1972

[54] ROTARY PLATE OIL BURNER Inventor: Shoichi Tsuji, Tokyo, Japan Ishikawajima Harima Jukogyo Kabushiki Kaisha, Tokyo-to, Japan Filed: Jan. 12, 1971 Appl. No.: 105,934

Related US. Application Data Continuation-impart of Ser. No. 18,146, March 10, 1970, abandoned.

Assignee:

US. Cl ..431/168, 239/222.1 1

Int. Cl ..F23d 11/04 Field of Search ..43 1/ 168; 239/2221 1 References Cited UNITED STATES PATENTS 1,762,356 6/1930 Schmidt ..239/222.11 2,011,901 8/1935 Latimer ....43l/l68X 2,815,806 12/1957 McGillis et 61., ..43l/l68 x Primary Examiner-Edward G. Favors Attorney-Nolte and Nolte [5 7] ABSTRACT An oil burner wherein a rotary blower system supplies air to a stationary fuel supply pipe. The pipe has no internal horizontal part except for a shorttip of its nozzle. This arrangement counteracts solidification of oil in the supply pipe. Said tip is positioned in such manner that liquid fuel is discharged therefrom centrally of, and in the direction toward, a rotary plate. A blower supplies compressed air to the interstice between housing and plate. From there, a mixture of oil and air then enters a burner ring or the like.

1 Claim, 6 Drawing Figures P'A'TE'N'TEDncI 10 I972 SHEET 1 [1F 4 INVENTOR BYWXM ATTORNEY PATENTED our 1 0 I972 SHEET 2 BF 4 saw/0w 752/17- INVENTOR WAW ATTORNEY ROTARY PLATE OIL BURNER This is a continuation-in-part of my copending application Ser. No. 18,146, filed Mar. 10, 1970 and now abandoned.

EXPLANATION OF THE INVENTION AND DESCRIPTION OF PROPOSED EMBODIMENTS Heavy liquid fuels, such as heavy oil, are generally atomized in order to burn. This is necessary in order that the fuels be atomized. Air is uniformly mixed with the atomized fuels, and is supplied at a high velocity so that the fuels can be burnt completely. The burners are frequently required to burn a small quantity of fuel, as completely as in the case of rated load combustion.

For atomizing the liquid fuel, rotary atomizers are widely used. They, and mainly the rotary-cup atomizers, have had the disadvantage that oil, remaining in a hollow rotary shaft or passage after stopping the combustion, tended to drop into a cup and to solidify, thereby building up stains and obstructions on inner surfaces of fuel passages. This problem is particularly obvious where furnace operations are started and stopped many times; in this case atomizing capacity of the rotary system has been reduced most seriously.

Sealing means have been required, as liquid fuel was supplied through a rotary shaft or the like. This was another problem, as the rotary atomizer became complicated in construction. It became most complex when primary air, for atomizing the fuel oil, was supplied independently of secondary air, for combustion. In this case, wide range combustion could be accomplished, but a plurality of blowers was required, so that the construction became more expensive. In many cases, when the combustion load was low, the air flow rate also was low, and good combustion could not be accomplished, as the flame tended to become too long, resulting in much smoke and soot. g

The present invention provides a wide range rotary burner which eliminates such defects as described above.

The present invention comprises a rotary plate securely fixed to a horizontal blower driving shaft, at a right angle relative thereto and at the end thereof located on the side of a combustion chamber. An air discharge space is defined between the rotary disc and a burner ring coaxial therewith. A vertical fuel oil supply pipe 10 has a short, terminal, horizontal tip or nozzle 11, which discharges toward the center of the disc surface facing toward said combustion chamber. Advantageously, the oil supply pipe has no horizontal portion, except a short nozzle 11. It has its lower end connected to a fuel oil reservoir.

The invention will now be described in greater detail, with reference to the accompanying drawings, in which;

FIG. 1 is an axial, sectional view, taken in a vertical plane, of one embodiment of the invention;

FIG. 2 is a front view of FIG. 1.

FIG. 3 is an axial sectional view of another embodiment.

FIG. 4 is a front view of FIG. 3.

FIG. 5 is a plan view of a detail from FIGS. 3 and 4; and

FIG. 6 is a view of the detail of FIG. 5 taken along lines 6--6 of FIG. 5.

As shown in FIGS. 1 and 2, a-rotary plate 1 is fixed to one end of a rotary shaft 3 which extends horizontally and defines the axis of a combustion chamber C in furnace F. A pulley 4 is fixed to the other end of the shaft, and a blower 2 is carried by the shaft 3, between pulley 4 and plate 1. In coaxial relation with shaft 3, there are provided: air inlet 6, fixed to the furnace near pulley 4; a burner ring 8 near plate 1; and guide vanes 7, between parts 6 and 8. The fuel oil is ejected toward the center of the rotary plate 1, from the tip of a fuel oil supply pipe 10 which is coupled hydraulically to a fuel oil pump 12 through a fuel oil reservoir 14 having a heater 13. Rotary shaft 3 is driven by a motor 5 through a belt 15 wrapped over pulley 4 and a pulley 4 on the shaft of motor 5.

A space 9 is defined between the outer periphery of rotary plate 1 and the inner surface of burner ring 8', and air is supplied to this space, by blower '2. For this purpose, furnace F has, directly at, within and upstream of the burner ring, a blower discharge or plenum chamber P, which receives air from between guide vanes 7 and discharges it against and along the rear surface of rotary plate 1, between stationary rods or vanes R, V. I

In operation, rotary plate 1 and blower 2 are rotated by motor 5, through the belt drive, so that air is introduced into the burner chamber C as indicated by arrows a-b-c-d-e, that is, from air inlet 6, through blower 2, between guide vanes 7, and through annular space 9. Heavy liquid-fuel, such as heavy oil, is heated by heater 13, at fuel oil reservoir 14 so that the viscosity of the fuel oil is reduced. The fuel oil is ejected toward the center of rotary plate 1. As plate I rotates, the ejected fuel oil expands rapidly over the surface of this plate, under the action of centrifugal force, and enters, in the form of a thin film, into the air which passes through the annular space 9. Such oil moves in contact with the surface of rotary plate 1 due to the tackiness of the fuel oil, but finally the thin film of oil separates from the peripheral edge of the rotary plate, is atomized, and is then mixed uniformly with the air of furnace F and forced into combustion chamber C.

When the operation is stopped, rotary shaft 3 still is rotated until the fuel oil remaining in the horizontal portion of nozzle 11 is completely ejected. This should be done even after the fuel oil feed is stopped. By this operation, all fuel oil upon the rotary plate 1 is atomized, no fuel oil remains upon the rotary plate, and no fuel oil settles or drops on horizontal surfaces after the oil burner is stopped. Fuel oil remaining in the supply pipe 10 only drops by its weight into the fuel oil reservoir 14, where it can be prevented from solidifying, by heating it. Thus the next operation is not adversely affected.

FIGS. 3 to 6 are views of an embodiment wherein a blower 22 and a rotary plate 21 are carried by a driving shaft 23; an annular air passage 29 is defined between said rotary plate 21 and burner ring 28 so that air may be forced into annular air passage 29 upon rotation of driving shaft 23; and air flow rate control ring 36 is provided which may be displaced relative to annular air passage 29, thereby varying the area of annular air passage 29 (driven by a motor 25 through a pulley 24, a belt 35 and a pulley 24). Air flow rate control ring 36, which varies the area of the annular air passage 29, is so disposed asto move in parallel with shaft 23, by a servomotor 37 through a rod 39 and a link mechanism 38 and 38'. A control valve 40 interposed in the fuel oil supply pipe 30 is operatively coupled to the servomotor 37 through a control link 41 so that the opening of the valve 40 may be suitably varied.

Upon rotation of blower 22 and rotary plate 21 by motor 25, the air which is sucked through suction port 26 in the direction indicated by the arrows is compressed by the blower 22 and is ejected through annular air passage 29. The fuel oil underpressure from the oil pump 32 through the fuel oil supply pipe 30 is ejected throughnozzle 31 toward the center of rotary plate 21. The ejected fuel. oil movably adheres to the surface of the rotary plate 21 and is expanded toward the peripheral edge of this plate because of the rotation thereof. When the fuel oil is separated from rotary plate 21, the oil is atomized and mixed with the air passing through annular air passage 29 so that the fuel oil is burnt completely.

By servomotor 37, link mechanism 38and 38 is actuated so that rod 39 is caused to slide in the axial 7 response to the flow rate of the air passing through the annular air passage 29. Thus the optimum condition can be obtained for combustion.

From the foregoing, it is seen that in the rotary plate type oil burner in accordance with the present invention, the operation is not adversely affected at all when various kinds of liquid fuel are used and that the former waste of fuel oil and time can be eliminated, thereby increasing the combustion efficiency. Flow rates of fluids can be controlled properly, under all combustion loads. The machine is simple in construction, as the rotary plate is made in unitary construction with the blower unit.

What is claimed is:

1. A'rotary plate type oil burner comprising a rotary plate, securely fixed to a horizontal driving shaft at a right angle relative thereto and at one end thereof on the side of a combustion chamber, said driving shaft carrying a blower; an air discharge space defined between the outer periphery of said rotary plate and a burner ring, disposed in coaxial relation with said driving shaft; and a fuel oil supply pipe having its fuel oil discharge nozzle directed toward the center of the surface facing toward said combustion chamber of said rotary plate, said fuel oil supply pipe having no horizontal portion except said nozzle and having its lower end connected to a fuel oil reservoir. 

1. A rotary plate type oil burner comprising a rotary plate, securely fixed to a horizontal driving shaft at a right angle relative thereto and at one end thereof on the side of a combustion chamber, said driving shaft carrying a blower; an air discharge space defined between the outer periphery of said rotary plate and a burner ring, disposed in coaxial relation with said driving shaft; and a fuel oil supply pipe having its fuel oil discharge nozzle directed toward the center of the surface facing toward said combustion chamber of said rotary plate, said fuel oil supply pipe having no horizontal portion except said nozzle and having its lower end connected to a fuel oil reservoir. 